Use constexpr TaskTraits constructor in extensions.

extensions/browser/updater/update_data_provider.cc

Index: extensions/browser/updater/update_data_provider.cc
diff --git a/extensions/browser/updater/update_data_provider.cc b/extensions/browser/updater/update_data_provider.cc
index 180eb5a12d3235c0673c5f63461ffc1a09ffab49..2ee26e44cf0fdc8c1df9ea9f5ee70ee5a415416a 100644
--- a/extensions/browser/updater/update_data_provider.cc
+++ b/extensions/browser/updater/update_data_provider.cc
@@ -60,8 +60,7 @@ void UpdateDataProvider::RunInstallCallback(const std::string& extension_id,
                                             const base::FilePath& temp_dir) {
   if (!context_) {
     base::PostTaskWithTraits(
-        FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                       base::TaskPriority::BACKGROUND),
+        FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
         base::Bind(base::IgnoreResult(&base::DeleteFile), temp_dir, false));
     return;
   } else {